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qr2

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Hatter Jiang
2020-05-24 22:19:28 +08:00
parent 99a4348c91
commit da918ad5fd
3 changed files with 18 additions and 7 deletions
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21
deno_wasm_qr/decodeqr/src/lib.rs
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@@ -1,25 +1,34 @@
use std::ffi::CString; use std::ffi::CString;
use std::os::raw::c_char; use std::os::raw::c_char;
pub const SAMPLE_QR_BYTES: &[u8] = std::include_bytes!("sample_qr.png"); pub const SAMPLE_QR_BYTES: &[u8] = std::include_bytes!("sample_qr.png");
pub const SAMPLE_QR_BYTES_2: &[u8] = std::include_bytes!("sample_qr_2.png");
#[no_mangle] #[no_mangle]
pub extern "C" fn parse_default_qr() -> *mut c_char { pub extern "C" fn parse_default_qr() -> *mut c_char {
let s = CString::new(parse_qr()).unwrap(); let s = CString::new(parse_qr(SAMPLE_QR_BYTES)).unwrap();
s.into_raw() s.into_raw()
} }
pub fn parse_qr() -> String { #[no_mangle]
let img = image::load_from_memory(SAMPLE_QR_BYTES).unwrap(); pub extern "C" fn parse_default_qr_2() -> *mut c_char {
let s = CString::new(parse_qr(SAMPLE_QR_BYTES_2)).unwrap();
s.into_raw()
}
pub fn parse_qr(bs: &[u8]) -> String {
let img = match image::load_from_memory(bs) {
Ok(i) => i, Err(e) => return format!("Load image error: {}", e),
};
let decoder = bardecoder::default_decoder(); let decoder = bardecoder::default_decoder();
let mut ret = vec![]; let mut ret = vec![];
let results = decoder.decode(&img); let results = decoder.decode(&img);
for result in results { for result in results {
let qr = result.unwrap(); let qr = result.unwrap_or_else(|e| format!("Decode QR error: {}", e));
println!("{}", qr); println!("{}", qr);
ret.push(qr); ret.push(qr);
} }
ret.join(",") ret.join("||")
} }

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deno_wasm_qr/decodeqr/src/sample_qr_2.png Normal file
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4
deno_wasm_qr/parse_qr.ts
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@@ -4,6 +4,7 @@ const wasmInstance = new WebAssembly.Instance(wasmModule);
const linearMemory = wasmInstance.exports.memory; const linearMemory = wasmInstance.exports.memory;
// from https://tilman.xyz/blog/2019/12/building-webassembly-for-deno/
function readString(memory, ptr) { function readString(memory, ptr) {
const mem = new Uint8Array(memory.buffer, ptr); const mem = new Uint8Array(memory.buffer, ptr);
let length; let length;
@@ -11,4 +12,5 @@ function readString(memory, ptr) {
return new TextDecoder("utf-8").decode(new Uint8Array(mem.buffer, ptr, length)); return new TextDecoder("utf-8").decode(new Uint8Array(mem.buffer, ptr, length));
} }
console.log(readString(linearMemory, wasmInstance.exports.parse_default_qr())); console.log("DECODED:\n" + readString(linearMemory, wasmInstance.exports.parse_default_qr()));
console.log("DECODED:\n" + readString(linearMemory, wasmInstance.exports.parse_default_qr_2()));